Definition of woofer noun from the Oxford Advanced Learner's Dictionary

 

woofer

 noun
noun
BrE BrE//ˈwuːfə(r)//
 
; NAmE NAmE//ˈwuːfər//
 
 
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a loudspeaker for reproducing the low notes in a sound system compare tweeter Word Origin 1930s: from the verb woof + -er.
See the Oxford Advanced American Dictionary entry: woofer